We are practitioners for the City of Philadelphia with extensive experience in cases and analysis regarding the extent to which the Commonwealth of Pennsylvania has, or has not, preempted local regulation in various subjects of concern to the City. As City attorneys, our perspective is based in our role as advocates for the preservation and defense of the City’s exercise of its home rule powers. In considering the city-state relationship, many of the practical, political and cultural issues addressed in Prof. Richard C.

The Endangered Species Act defines an endangered species as one at risk of extinction “throughout all or a significant portion of its range.” The U.S. Department of the Interior (DOI) has repeatedly defined “significant portion” to mean an area of the range essential to species persistence. This definition is redundant, and various iterations of the definition have been struck down in the past. At the same time, other proposals to list a species only in a portion of its range fail to satisfy the statutory requirements.

On March 11, 2019, the National Oceanic and Atmospheric Administration published an advance notice of proposed rulemaking to amend regulations that implement the Coastal Zone Management Act’s (CZMA’s) consistency requirement. This Article places the notice in context, focusing on the CZMA’s role in state review of offshore oil and gas development and its evolution to provide a predictable framework that balances coastal state interests with the nation’s energy needs.

The principles of “common but differentiated responsibility” (CBDR) and sustainable development play an integral role in international environmental law. However, these principles have come under fire in recent years, particularly from the global North, which has grown impatient over the lack of contribution on climate change from the emerging economies. Much effort has been expended toward the establishment of greater contribution, and the shouldering of greater responsibility from these countries.

In 1990, when the Clean Air Act (CAA) was last substantially amended, atmospheric carbon dioxide levels stood at about 350 parts per million (ppm). Now they are close to 414 ppm, and the U.S.

In recent years, the drumbeat for more expansive climate-related corporate disclosures has grown louder and more consistent within a broader swath of the financial community. This intensifying call argues for considering more climate-related information legally material under existing U.S. securities disclosure law. A key component of materiality as defined in U.S. securities law—who is a “reasonable investor”—is evolving when it comes to climate-related information. This evolution may soon impact what climate-related information courts consider material.

Marine litter is human-created waste that has been discharged into the marine environment, including glass, metal, plastics, and other debris. According to data compiled by the United Nations, the equivalent of a garbage truck filled with plastic is dumped into the ocean every minute—more than 8 million metric tons per year. On November 11, 2019, the Environmental Law Institute hosted an expert panel that explored recent U.S.

Our country's landscape has changed dramatically over the last 50 years as a result of numerous governmental policies and subsidies that encourage low-density development commonly referred to as "sprawl." Sprawl results in environmental problems ranging from air pollution to wetland degradation. Our countryside is disappearing and becoming more fragmented, while urban areas are simply neglected. Moreover, this type of growth, which has gone unchecked for the latter half of this century, increases traffic congestion, strains public budgets, and deteriorates our quality of life.

Enhanced oil recovery has generated an immense and growing market for carbon dioxide (CO2), which has uses in manufacturing, medical, and industrial settings. In the next 30 years, these combined end-uses will necessitate a three- to fivefold expansion of existing CO2 transportation infrastructure in the United States. A more flexible, extensive, and integrated CO2 pipeline network is necessary to accommodate this growing demand.